Since I'm being downvoted for what I thought is a common sense answer, here is a more elaborated one:

1. HN is a mostly technical forum, with a technically inclined user base.

2. Statistics show that there are less women working in Tech than men [1,2]. This can be translated in interest in Tech.

3. Only a fraction of those women would be on HN, and only a fraction of them would be pregnant.

4. One more data point: https://news.ycombinator.com/item?id=5520342

You can therefore safely assume that it's a very tiny number, which can not explain the NO responses of this poll.

[1] https://www.womentech.net/en-fr/women-technology-statistics

[2] https://www.isemag.com/2020/10/telecom-the-latest-stats-on-w...